Add NATS account-balance SoT and statement review for customers, CS, and sales

Internal billing now uses verae.billing.* request-reply and pubs. zappier-account-balance tracks prepaid, credits, usage, and payments. Portal, admin, CS, and sales all review the same statement. Independent Forgejo repos stay split via push-module-repos.

packages/zappier-customer-service/test/health.test.js

@@ -18,7 +18,45 @@ test('customer-service health', async () => {
     const r = await fetch(`http://127.0.0.1:${port}/health`);
     const body = await r.json();
     assert.equal(body.role, 'zappier-customer-service');
+    const home = await fetch(`http://127.0.0.1:${port}/`);
+    assert.equal(home.status, 200);
+    assert.match(await home.text(), /Customer service/);
   } finally {
     child.kill('SIGTERM');
   }
 });
+
+test('customer-service review via account-balance HTTP', async () => {
+  const booksPort = 18014;
+  const csPort = 18015;
+  const books = spawn(process.execPath, ['src/server.js'], {
+    cwd: path.join(root, '..', 'zappier-account-balance'),
+    env: { ...process.env, PORT: String(booksPort) },
+    stdio: ['ignore', 'pipe', 'pipe'],
+  });
+  const cs = spawn(process.execPath, ['src/server.js'], {
+    cwd: path.join(root),
+    env: {
+      ...process.env,
+      PORT: String(csPort),
+      ACCOUNT_BALANCE_URL: `http://127.0.0.1:${booksPort}`,
+    },
+    stdio: ['ignore', 'pipe', 'pipe'],
+  });
+  await new Promise((r) => setTimeout(r, 500));
+  try {
+    const add = await fetch(`http://127.0.0.1:${csPort}/credits`, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({ customerId: 'c-review', cents: 700, reason: 'goodwill', agent: 'cs' }),
+    });
+    assert.equal(add.status, 200);
+    const st = await (await fetch(`http://127.0.0.1:${csPort}/review/c-review`)).json();
+    assert.equal(st.prepaidCents, 700);
+    assert.equal(st.source, 'account-balance');
+    assert.equal(st.credits[0].reason, 'goodwill');
+  } finally {
+    cs.kill('SIGTERM');
+    books.kill('SIGTERM');
+  }
+});